| 纳米结构ZnxFe3-xO4-α-Fe2O3多晶材料中的巨隧道磁电阻效应 |
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| 引用本文： | 都有为,陈鹏,朱建民,邢定钰.纳米结构ZnxFe3-xO4-α-Fe2O3多晶材料中的巨隧道磁电阻效应[J].物理学报,2001,50(11):2275-2277. |
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| 作者姓名： | 都有为 陈鹏 朱建民 邢定钰 |
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| 作者单位： | 南京大学固体微结构物理国家重点实验室物理系,南京210093 |
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| 摘 要： | 在具有纳米绝缘层的多晶锌铁氧体体系中,当晶界为α-Fe2O3纳米量级(6—7nm)的绝缘层时,则构成(ZnxFe3-xO4)-α-Fe2O3非均匀体,高分辨电子显微镜已证实了这种微结构,该体系在0.5T磁场、4.2K温度下,磁电阻效应可达1280%,300℃下为158%.
关键词：
隧道磁电阻效应
锌铁氧体
纳米结构
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| 关 键 词： | 隧道磁电阻效应 锌铁氧体 纳米结构 |
| 收稿时间： | 2001-08-28 |
| 修稿时间： | 2001年8月28日 |
GIANT TUNNELING MAGNETORESISTANCE IN NANOSTRUCTURED Znx Fe3-x
O4- |
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| DU YOU-WEI,CHEN PENG,ZHU JIAN-MIN and XING DING-YU.GIANT TUNNELING MAGNETORESISTANCE IN NANOSTRUCTURED Znx Fe3-x
O4-[J].Acta Physica Sinica,2001,50(11):2275-2277. |
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| Authors: | DU YOU-WEI CHEN PENG ZHU JIAN-MIN and XING DING-YU |
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| Abstract: | Giant tunneling magnetoresistance effect (TMR) as large as 1280% at 4.2K and 158% at 300K was observed in Zn0.41Fe2.59O4-α-Fe2O3 polycrystalline sample. The Zn0.41Fe2.59O4 grains are separated by insulating α-Fe2O3 thin layer boundaries, The pattern of nanostructure has been verified by TEM and HREM and the thickness of α-Fe2O3 boundary is about 6-7nm. The huge TMR is attributed to the high spin-polarization of Zn0.41Fe2.59O4 grains and insulating antiferromagnetic α-Fe2O3 thin layer. The ZnxFe3-xO4 ferrite is a new type half-metallic material with a huge TMR at room temperature is interesting to further study in future. |
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| Keywords: | tunneling magnetoresistance effect zinc ferrite nanostructure |
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